JPH0330264A - Method for joining superconducting ceramic - Google Patents
Method for joining superconducting ceramicInfo
- Publication number
- JPH0330264A JPH0330264A JP16482689A JP16482689A JPH0330264A JP H0330264 A JPH0330264 A JP H0330264A JP 16482689 A JP16482689 A JP 16482689A JP 16482689 A JP16482689 A JP 16482689A JP H0330264 A JPH0330264 A JP H0330264A
- Authority
- JP
- Japan
- Prior art keywords
- superconducting
- high temperature
- bonding
- uniaxial
- ceramics
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000013078 crystal Substances 0.000 claims abstract description 4
- 229910002480 Cu-O Inorganic materials 0.000 claims abstract 2
- 238000009792 diffusion process Methods 0.000 abstract description 4
- 238000005242 forging Methods 0.000 abstract 1
- 238000007731 hot pressing Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 238000005452 bending Methods 0.000 description 4
- 239000012071 phase Substances 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 239000005751 Copper oxide Substances 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910000416 bismuth oxide Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 description 1
- 229910000464 lead oxide Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229910000018 strontium carbonate Inorganic materials 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
Landscapes
- Inorganic Compounds Of Heavy Metals (AREA)
- Ceramic Products (AREA)
Abstract
Description
【発明の詳細な説明】
（ａ）技術分野の説明
本発明は、ブロック状超電導コイルや超電導磁（ｂ）従
来技術の説明
超電導体には、ゼロ抵抗、ジョセフソン効果、完全反磁
性などの特異な性質があり、それらの現象を利用して巨
大な超電導発電機、超高速コンピュータなどの開発が見
込まれている。最近になって、液体窒素温度以上で超電
導を示す高温超７Ｒ導セラミックスが発見されるに伴い
、産業への応用は、電力、エレクトロニクス、輸送、医
療などの各分野で飛躍的に広がり、近未来の社会を変え
てしまうことが予期されている。Detailed Description of the Invention (a) Description of the technical field The present invention is based on block-shaped superconducting coils and superconducting magnets. (b) Description of the prior art These phenomena are expected to be used to develop giant superconducting generators, ultra-high-speed computers, and other devices. Recently, with the discovery of high-temperature super 7R conductive ceramics that exhibit superconductivity above liquid nitrogen temperatures, industrial applications have expanded dramatically in various fields such as electric power, electronics, transportation, and medicine, and are expected to be used in the near future. It is expected that this will change the society of the world.
しかしながら、これらの材料を実用化する段階で、特に
、電力応用の分野では超電導セラミックスと超電導セラ
ミックスとの接合化は超電導応用システムの開発に必要
不可欠な技術要素であり、ではならない。超電導セラミ
ックスの接合化に関ばならない問題点がある。However, at the stage of putting these materials into practical use, especially in the field of electric power applications, the bonding of superconducting ceramics to superconducting ceramics is an essential technical element for the development of superconducting application systems. There are problems unrelated to bonding superconducting ceramics.
する研究は現段階では皆無であり、その技術開発が強く
望まれている。There is currently no research to do so, and the development of this technology is strongly desired.
（Ｃ）発明が解決しようとする問題点
超電導セラミックスの接合には、接合強度の強さと共に
超電導セラミックスの持つ高い臨界電流密度が接合界面
でも保持されなければならない。(C) Problems to be Solved by the Invention In joining superconducting ceramics, it is necessary to maintain high joint strength and the high critical current density of superconducting ceramics at the joining interface.
特に、接合界面に異相が生成すると超電導電流が阻止さ
れる。セラミックス構造材料では、一般に添加物を加え
て接合界面に中間生成層を生成させることにより強固な
接合を図ってきてきたが、超電導セラミックスでは、大
電流を流すためには添加物を加えることなく超電導セラ
ミックス同士の拡散により接合しなければならない。ま
た、最近発見された酸化物系高温超電導体は結晶構造の
関係から超電導電流においても２次元的な異方性を示し
ており、大電流を流すに望ましい方向に超電導セラミッ
クスを当接して接合し、接合界面にお（ｄ）問題を解決
しようとする手段
本発明は前記事情に鑑み、従来の問題点を解決しようと
するもので、機械的応力などの利用により微″Ｗ結晶粒
子を特定方向に揃えた高い臨界電流密度を持つ超電導セ
ラミックス焼結体の電流の流れやすい方向に垂直な表面
をそれぞれ合わせて、接合表面に垂直方向に一軸性高温
加圧処理して容易かつ確実に接合できる方法を提供しよ
うとするものであり、６００℃以上、１０Ｋ３／ｃｍ２
以上の加圧温度で、超電導セラミックス同士の相互拡散
が容易に起こり、機械的に強固で、臨界Ｗｉ流密度の高
い超電導セラミックス接合体を得る接合方法を提供する
ものである．
なお、上記の一軸性の高温加圧処理の方法としては、ホ
ットプレス法、ホットフォージ法なとがある。In particular, if a different phase is generated at the bonding interface, superconducting current is blocked. In ceramic structural materials, strong bonding has generally been achieved by adding additives to generate an intermediate layer at the bonding interface. Ceramics must be bonded by diffusion. In addition, recently discovered oxide-based high-temperature superconductors exhibit two-dimensional anisotropy in superconducting current due to their crystal structure, and superconducting ceramics can be bonded by contacting them in the desired direction to flow a large current. (d) Means for Solving the Problem In view of the above circumstances, the present invention is an attempt to solve the conventional problems, and the present invention aims to solve the conventional problems by directing fine W crystal grains in a specific direction by using mechanical stress or the like. A method for easily and reliably joining superconducting ceramic sintered bodies with high critical current densities aligned with each other by aligning the surfaces perpendicular to the direction in which current flows and applying uniaxial high temperature pressure in the direction perpendicular to the joining surfaces. 600℃ or higher, 10K3/cm2
The present invention provides a bonding method in which mutual diffusion between superconducting ceramics easily occurs at the above pressurizing temperature, and a superconducting ceramic bonded body that is mechanically strong and has a high critical Wi flow density is obtained. Note that methods for the above-mentioned uniaxial high-temperature pressure treatment include a hot press method and a hot forge method.
上記構成に基づく接合方法により、超電導セラミックス
同士が充分な接合強度をもって接合でき、また、超電導
セラミックス同士の相互拡散による接合であるために接
合界面には異相の生成はなく、高い臨界電流密度を有す
る高温超電導セラミックス接合体が作製できた。この発
明は超電導セラミックスの接合化を可能とし、各種の超
電導応用システムの開発が可能となり、超電導セラミッ
クス材料としての実用化が加速される。The bonding method based on the above structure allows superconducting ceramics to be bonded with sufficient bonding strength, and since the bonding is based on mutual diffusion between superconducting ceramics, there is no generation of different phases at the bonding interface, resulting in a high critical current density. A high-temperature superconducting ceramic bonded body was fabricated. This invention enables the bonding of superconducting ceramics, enables the development of various superconducting application systems, and accelerates the practical application of superconducting ceramic materials.
（ｆ）発明の実施例
以下に実施例をあげて具体的に説明する。接合するため
の焼結体試験片としては、１１０級の臨界温度を示すＢ
ｉ＋．ｅＰｂｓ．ａＳｒ＋．ａＣａ２２ＣＩＪ２．ｓＯ
ｚなる組成を選び、出発原料として通常入手しろる酸化
ビスマス、酸化鉛、炭酸ストロンチウム、炭酸カルシウ
ム及び酸化銅を用いた。(f) Examples of the Invention The following examples will be specifically explained. As a sintered compact test piece for joining, B which has a critical temperature of 110 class is used.
i+. ePbs. aSr+. aCa22CIJ2. sO
The composition z was selected, and commonly available bismuth oxide, lead oxide, strontium carbonate, calcium carbonate, and copper oxide were used as starting materials.
その調合物を８３０℃、６０時間で固相反応させて超電
導セラミックスの単一相を作り、それを粉砕したものを
ホットプレスＨ置を用いて８３０℃、３００Ｋ８／ｃ１
の条件で２時間高温加圧成形・焼結を行った。The mixture was subjected to a solid phase reaction at 830°C for 60 hours to produce a single phase of superconducting ceramics, which was then crushed using a hot press at 830°C and 300K8/c1.
High-temperature pressure forming and sintering was performed under the following conditions for 2 hours.
焼結体の密度は６．２ｋｇ／ｃｍ３で、理論密度の９５
％以上であった。Ｘ線回折法によって調べると、Ｃ軸は
加圧方向に平行に配向し、また、超電導のＭ．流方向で
あるａ軸ないしｂ軸は加圧方向に垂直に配向した焼結体
ブロックになり、配向度は少なくとも９５％以上あった
。このようにして得られた高緻密な焼結体ブロックから
カッターを用いて第１図に示す要領で切断して標準試験
片（供試材寸法１８ｘ７ｘ７ｍｍ）を、さらに２分割し
て接合用試験片（同９ｘ７ｘ７ｍｍ〉を作製した。この
ような同一の焼結体ブロックから切断して得た試験片を
下記の実施例に示すような接合条件で行い、さらに、接
合後の試験片と標準試験片を空気中８３０℃、４０時間
で同時に熱処理し、標準試験片と接合後の試験片の臨界
温度、臨界電流密度、接合強度を測定し、比較検討した
。上記条件で熱処理した標準試験片の臨界温度は１０８
℃で、７７Ｋでの臨界電流密度は７３１Ａ／ｃｍ２で、
この接合強度な抗折試験によって求めると、実施例１
第１図に示す要領で当接した２つの接合用試験片を大気
中８００℃、２５Ｋｇ／ＣＩＴｌ２、３０分で一軸性高
温加圧処理して接合し、標準試料片と同様の条件で熱処
理した結果、接合体試験片の臨界温度は１０８Ｋで、７
７Ｋでの臨界電流密度は６２１Ａ／ｃｍ２であった。The density of the sintered body is 6.2 kg/cm3, which is 95% of the theoretical density.
% or more. When examined by X-ray diffraction, the C axis is oriented parallel to the pressurizing direction, and the M. The a-axis or b-axis, which is the flow direction, was oriented perpendicularly to the pressurizing direction, resulting in a sintered block, and the degree of orientation was at least 95%. The highly dense sintered block thus obtained was cut using a cutter in the manner shown in Figure 1 to obtain a standard test piece (sample material size: 18x7x7mm), which was further divided into two to give a test piece for bonding. (The same 9 x 7 x 7 mm) was prepared. Test pieces obtained by cutting from such the same sintered block were bonded under the conditions shown in the examples below, and the test pieces after bonding and the standard test pieces were bonded. were simultaneously heat-treated in air at 830°C for 40 hours, and the critical temperature, critical current density, and bonding strength of the standard test piece and the test piece after bonding were measured and compared.The critical temperature of the standard test piece heat-treated under the above conditions The temperature is 108
℃, the critical current density at 77K is 731A/cm2,
The bonding strength was determined by a bending test. Example 1 Two bonding test pieces that were brought into contact as shown in Figure 1 were subjected to uniaxial high-temperature pressure treatment at 800°C in the air at 25 kg/CITl2 for 30 minutes. As a result of heat treatment under the same conditions as the standard sample, the critical temperature of the bonded specimen was 108K and 7.
The critical current density at 7K was 621A/cm2.
また、この接合強度を抗折試験によって求めると、約１
３Ｋ，ｇｆ／ｍｍ２で、破壊は接合面の近傍からおこっ
た。In addition, when this bonding strength is determined by a bending test, it is approximately 1
At 3K, gf/mm2, failure occurred near the joint surface.
実施例２
第１図に示す要領で当接した２つの接合用試験片を大気
中７８０℃、２５Ｋｇ／ａｍ２、３０分で一軸性高温加
圧処理して接合し、標準試料片と同様の条件で熱処理し
た結果、接合体試験片の臨界温度は１０８Ｋテ、７７Ｋ
テノ臨界′ｒｌ．流密度Ｌｔ ５１１Ａ／ｃｍ２テアッ
タ。Example 2 Two bonding test pieces that were brought into contact as shown in Figure 1 were bonded by uniaxial high-temperature pressure treatment at 780°C in the atmosphere at 25 kg/am2 for 30 minutes, under the same conditions as the standard sample pieces. As a result of heat treatment at
tenocritical'rl. Flow density Lt 511A/cm2teata.
また、この接合強度を抗折試験によって求めると、約１
０κｇ，ｆ／…ｆｆｌ２で、接合面から破壊した。In addition, when this bonding strength is determined by a bending test, it is approximately 1
At 0κg, f/...ffl2, it broke from the joint surface.
実施例３
第１図に示す要領で当接した２つの接合用試験片を大気
中７８０℃、５０ Ｋｇ／ｃｒ’、３０分で一軸性件て
熱処理した結果、接合体試験片の臨界温度は１０８Ｋで
、７７Ｋでの臨界電流密度は５８５Ａ／ｃｍ２であった
。Example 3 Two test pieces for bonding that were brought into contact as shown in Figure 1 were heat treated in the atmosphere at 780°C, 50 Kg/cr' for 30 minutes under uniaxial conditions, and the critical temperature of the bonded test piece was found to be At 108K, the critical current density at 77K was 585A/cm2.
また、この接合強度を抗折試験によって求めると、約１
３Ｋｇｆ／ｆｆｌｌＴｌ２で、破壊は接合面の近傍から
おこった。In addition, when this bonding strength is determined by a bending test, it is approximately 1
At 3Kgf/ffllTl2, failure occurred near the joint surface.
（ｇ）発明の効果
以上述べたごとく、本発明によれば、臨界温度や臨界電
流密度などの超電導特性を保持して超電導セラミックス
同士を強固に接合することができ、超電導セラミックス
部材を用いて超電導ブロックコイル、超電導磁スシール
ド、超電導キャビティなど複雑形状の超電導応用部品を
作製することが可能となり、本発明の工業的価値は極め
て大きい。(g) Effects of the Invention As described above, according to the present invention, superconducting ceramics can be firmly bonded to each other while maintaining superconducting properties such as critical temperature and critical current density, and superconducting ceramics can be used to conduct superconducting It becomes possible to produce superconducting application parts with complex shapes such as block coils, superconducting magnetic shields, and superconducting cavities, and the industrial value of the present invention is extremely large.
第１図は本発明に係わる超電導セラミックスの接合方法
の実施例における接合要領の説明図である。FIG. 1 is an explanatory diagram of a joining procedure in an embodiment of the method for joining superconducting ceramics according to the present invention.
Claims (1)
微組織を有する２つ以上の高温超電導セラミックスに対
して、結晶方向が同じ焼結体表面を当接して、６００℃
〜９５０℃の温度範囲で、また１０Ｋｇ／ｃｍ＾２〜１
００Ｋｇ／ｃｍ＾２加圧の範囲で一軸性高温加圧処理す
ることにより、高臨界温度や高臨界電流密度などの超電
導特性を保持しつつ強固に接合することを特徴とする超
電導セラミックスの接合方法。Two or more high-temperature superconducting ceramics having particle-oriented microstructures such as Bi-Pb-Sr-Ca-Cu-O system are brought into contact with the surfaces of the sintered bodies having the same crystal direction and heated at 600°C.
In the temperature range of ~950℃, also 10Kg/cm^2~1
A method for bonding superconducting ceramics characterized by strongly bonding while maintaining superconducting properties such as high critical temperature and high critical current density by uniaxial high-temperature pressure treatment in the range of 00 kg/cm^2 pressure. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16482689A JPH0330264A (en) | 1989-06-27 | 1989-06-27 | Method for joining superconducting ceramic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16482689A JPH0330264A (en) | 1989-06-27 | 1989-06-27 | Method for joining superconducting ceramic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0330264A true JPH0330264A (en) | 1991-02-08 |
| JPH0514383B2 JPH0514383B2 (en) | 1993-02-24 |
Family
ID=15800655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16482689A Granted JPH0330264A (en) | 1989-06-27 | 1989-06-27 | Method for joining superconducting ceramic |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0330264A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0634379A1 (en) * | 1992-04-03 | 1995-01-18 | Nippon Steel Corporation | Bonded element of superconductive oxide materials and its manufacture |
| US5439879A (en) * | 1992-02-14 | 1995-08-08 | University Of Houston-University Park | Method for joining superconductor segments to form a superconducting article |
| US6194226B1 (en) | 1991-02-25 | 2001-02-27 | Sumitomo Electric Industries, Ltd. | Junction between wires employing oxide superconductors and joining method therefor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08296861A (en) * | 1995-04-28 | 1996-11-12 | Shinten Kogyo Kk | Floor heater |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61273276A (en) * | 1985-05-28 | 1986-12-03 | Toshiba Corp | Joining method for superconductive wire |
| JPS627671A (en) * | 1985-07-01 | 1987-01-14 | 日本坩堝株式会社 | Nozzle for steel continuous casting |
-
1989
- 1989-06-27 JP JP16482689A patent/JPH0330264A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61273276A (en) * | 1985-05-28 | 1986-12-03 | Toshiba Corp | Joining method for superconductive wire |
| JPS627671A (en) * | 1985-07-01 | 1987-01-14 | 日本坩堝株式会社 | Nozzle for steel continuous casting |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6194226B1 (en) | 1991-02-25 | 2001-02-27 | Sumitomo Electric Industries, Ltd. | Junction between wires employing oxide superconductors and joining method therefor |
| US5439879A (en) * | 1992-02-14 | 1995-08-08 | University Of Houston-University Park | Method for joining superconductor segments to form a superconducting article |
| EP0634379A1 (en) * | 1992-04-03 | 1995-01-18 | Nippon Steel Corporation | Bonded element of superconductive oxide materials and its manufacture |
| EP0634379A4 (en) * | 1992-04-03 | 1995-04-19 | Nippon Steel Corp | Bonded element of superconductive oxide materials and its manufacture. |
| US5786304A (en) * | 1992-04-03 | 1998-07-28 | Nippon Steel Corporation | Joining product of oxide superconducting material and process for producing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0514383B2 (en) | 1993-02-24 |
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